#include<stdio.h>
int main()
{
	float b=0;
	int t=0;
	double sum;
	scanf_s("%f %d", &b ,&t);
	double n;
	switch (t)
	{
	case 1:
		n = 0.00315;
		sum = b+b*n*t*12;
		printf("%.2f", sum);
		break;
	case 2:
		n = 0.00330;
		sum = b + b * n * t * 12;
		printf("%.2f", sum);
		break;
	case 3:
		n = 0.00345;
		sum = b + b * n * t * 12;
		printf("%.2f", sum);
		break;
  		printf("input error!\n");
	}
	return 0;

}

